GCN Circular 41830
Subject
GRB250912A: VLT/HAWK-I follow-up observations
Event
Date
2025-09-14T12:29:31Z (7 days ago)
From
Roberto Ricci at INAF-IRA <ricci@ira.inaf.it>
Via
Web form
R. Ricci (U Rome), E. Troja (U Rome), M. Yadav (U Rome) and Y. Yang (U. Rome) report:
We observed the field of GRB250912A discovered by Fermi/GBM (Fermi GBM team GCN 41819) and SVOM (Ducoin et al. GCN 41820) and classified as a possible short GRB with extended emission (Wang et al. GCN 41826) using the VLT UT4 (Yepun) telescope equipped with the HAWK-I near-infrared imager. Our observations were centered on the SVOM/MXT position (Ducoin et al. GCN 41820) and were carried out in the J filter for a net exposure time of 15 minutes starting on Sep 14th 03:58 UT (31 hours after the trigger).
The source reported by Malesani et al. (GCN 41829) and located at coordinates (J2000):
RA = 00:59:44.39
Dec = +11:10:07.0
is detected in our imaging with J ~ 22.20 AB mag, thus not showing significant variability since the previous night. No other obvious counterpart is evident in our observations.
Further observations are planned.
We thank the VLT Observatory staff for promptly executing the observations.